Means for attaching blankets to cylinders of printing-presses.



PATENTED MAR. 8, 1904.

:A. B. STEWART. MEANS FOR ATTAGHING BLANKETS TO- CYLINDERS OFPRINTHLGPRESSES.

APPLICATION FILED JUNE 29. 1901.

H0 MODEL.

Af/omey UNITED STATES PATENT OFF CE.

ANDREW BARCLAY, S EWARTQOF' BROOKLYN, NEW YO K.

MEANS FOR ATTACH-lNG BLANKETS T CYLINDERS 0F PliINTlNG-PRESSEStSPECIFICATION forming part of Letters Patent No. 754,253, dated March 8,1e04,

Application filed June 29, 1901.

To all whom, it may concern.-

Be it known that], ANDR n'w BARCLAY STEW- ART, a citizen of the UnitedStates, residing in Brooklyn, in the county of Kings and State of NewYork, have invented certain new and useful Improvements in Means forAttaching Blankets to Cylinders of Printing-Presses; and

, Ido declare the following to be a full, clear, and i vide means whichwill admit of the ready attachment and detachment of the blanket withoutthe loss of valuable time and without the necessity of an entire removalof the fasten ing means or parts thereof in the operation of attachingor detaching the blanket to or from the impression-body of the press.

To the accomplishment of the foregoing and such other objects as mayhereinafter appear,

the invention consists in the construction and in the combination. ofparts hereinafter particularly described and then sought to be clearlydefined by the claims, reference being had to the accompanying drawings,forming a part hereof, and in which Figure 1 is an end view of theimpressioncylinder of a printing-press having applied thereto the typeof blanket for which my fastening means is particularly'well adapted.

' its unlocked position.

Fig. 2 is a front elevation of an impressioncylinder with a portionbroken away, showing the blanket applied to a segment of the-cylin der.Fig. 3 is a front view of the flange portion of the metallic face-plateof the blanket, showing the manner of, forming slots in the flange toreeeivethe eccentric-headed clamping-screw, the head of the screwappearing in Fig. 4 is a similar view showing the eccentric headed screwin its clamping position, and Fig. 5 is a detail sectional View throughone segment of the imprcssion-cylinder with portions broken awaySerialNo. 6f S.466.- (N0 modelf I hand the parts illustratedon anenlarged scale or full size to clearlyillustrate the fastening means. I

In the drawings the numeral 1 designates a printing press impressioncylinder having two segmental impression-surfaces 2 of ordinaryconstruction and showing applied to one of the segments a blanketconsisting of an elastic bod y 3 and a flexible metallic face-plategeneral of ordinary construction and at present in practical use. Vliththe parts so constructed it was the practice prior to my invention tosecure the flanged end of the blanket to the cylinder by means of screwspassed through the flange of the blanket and into the edge of thecylinder, with the heads of the screws fitting into countersunk portionsof the flange. The objection to that method of fastening the flanged endof the blanketto the cylinder is that when it is necessary to addadditional packing or elastic body underneath the metal face-plate it isnecessary to remove all the screws in order to unfastr o the metalface-plate and permit it to be removed so as to supply the additionalpacking, and, furthermore, the countersunk formation'twill under someconditions prevent the blanket from being drawn down tightly at the edgeof the cylinder where the flange overlaps the edge of the cylinder.These objections are serious, because time is an important factor in theadjustment and fastening of the blankets to the cylinders. have devisedthe construction consisting in forming eccentric or elongated slots 11,one for each screw, in the flange 5 of the blanket, and in providingscrews 12, formed with eccentric heads 13, the eccentric or elongatedform of theslot permitting the flange to be slipped To overcome theseobjections, I

. cylinder by turning the screw so as to bring its eccentric oroverhanging head portion over the flange along the edge of the slot'inwhich the screw fits. This has the effect not merely of bringing theeccentric head in such position that the flange will not slip over thehead, but also the eflect of the head drawing down onto the flange atthe, same time, so as to draw it closely to the edge of the cylinder,thus securely clamping the flange to the cylinder,

while at the same time preventing it from slipping over the head of thescrew. It will also be-observed that the slot is materially deeper thanthe thickness of the shank of the screw, which feature enables theflange portion of the blanket to be adjusted or depressed more or less,as may be necessary in order to secure a tight fit of the blanketagainst the surface of the. cylinder at the point where the flangeoccurs and when adjusted to-such position to be held or clamped in thatposition bythe eccentric portion of the head "bearing against the faceof the flange and by the screw action clamping it to the edge of thecylinder. The advantages of these points or features will be apparent tothe skilled in the art, and it will be observed that the means by whichthey are attained are both simple and efficient.

While I have illustrated and described the invention asapplied to animpression-cylind er, yet it will be understoodthat the invention may beused with other forms of impressionsurfaces than the cylindrical form,although it is of especial advantage when employed in connection withimpression-cylinders of printing-presses.

While I have illustrated and described the preferred form of thefeatures constituting my'invention, yet it is to be understood thatchanges can be made in the form of the parts and essential features,broadly consid ercd, still be retained.

Havingdescribed my invention and set forth its merits, what 1 claimis- 1. In a printing-press,the combination with the impression-bodyportion of the press, of a blanket formed with an opening, and a headedclamping device arranged to pass through said opening and adapted to beturned to bring its head down upon the blanket by a drawing action, theopening in the blanket being larger than the greatest diameter of the 2.In a printingpress,the combination with i the impression-body portion ofthe press,.of'

an eccentric-headed screw entering the said impression body portion, anda blanket formed with an opening to receive the eccentric-headed screw,said opening being eccentric to the screw and said screw adapted byrotation to have its eccentric portion brought over the blanket and toexert a screwdrawing action thereon, thereby tending to draw the blankettaut and clamp it to the impression-body portion, substantially asdescribed.

3. In a printing-press, the combination with an impression-cylinder, ofa blanket having a flange adapted to fit over-an edge of the cylinderand formed with an opening, a reel-rod having the opposite end of theblanket connected therewith, and an eccentric-headed screw passedthrough the opening in the flange of the blanket and entering the edgeof the cylinder, the opening in the flange being eccentric to the shankof the screw, and said screw in its unclamping position permitting theflange portion of the blanket to slip over its head and in its clampingposition having its eccentric head clamp the flange to the edge of thecylinder by a drawing action, thereby tending to draw the blanket tautupon the impression-body portion of the. press, substantially asdescribed.

4. In a printi ng-press, the combination with the impression-bodyportion of the press, of a blanket having a flange formed with anopening, and an eccentric-headed screw entering the body-impressionportion, said screw in one position adapted to have the apertured flangeportion slip over its head and in another p01 sition to have theeccentric portion of the head bear against the flange and clamp it tothe impression-body portion by a drawing action, thereby tending to drawthe blanket taut upon the impression-body portion of the press, theopening in the flange being materially larger than the thickness of theshank of the screw to permit adjustment of the blanket, substantially asdescribed.

In testimony whereof I aflix my signature in presence of two witnesses.

HENRY Sonon, Jr., JAs. E. MGKENNA.

